Processors
The Nokia N900 is powered by a high-end OMAP 3430 ARM Cortex A8 which is a System-on-a-chip made by Texas Instruments based on a 65-nanometer CMOS process. The OMAP 3430 is composed of three microprocessors; the Cortex A8 running at 600 MHz used to run the OS and applications, the PowerVR SGX 530 GPU made by Imagination Technologies which supports OpenGL ES 2.0 and is capable of up to 14 MPolys/s and a TMS320C64x, the digital signal processors, running at 430 MHz used to run the image processing (camera), audio processing (telephony) and data transmission. The TMS320 C64x main purpose is to offload the Cortex A8 from having to process audio and video signal.[32] Moreover the OMAP 3430 on some N900 devices has been successfully over-clocked upto 1150Mhz by using a modified kernel and editing the kernel power configuration file.[33] The system has 256 MB of dedicated high performance RAM (Mobile DDR) paired with access to 768 MB swap space managed by the OS.[2] This provides a total of 1 GB of virtual memory.
[edit] Screen and input
The Nokia N900 has a 3.5 inch resistive touchscreen with a resolution of 800 × 480 pixel (WVGA, 267 ppi) capable of displaying up to 65K colors.[34] The LCD is transreflective to permit usability over a wide range of luminosity (from daylight to dark). Haptic feedback is provided to touchscreen input by applying a small vibration or a sound; the user can choose whether to have this feature enabled.[35] A stylus is provided to allow more precise touch input and access to smaller user interface elements. A 3-axis accelerometer allows the orientation of the screen to change between portrait and landscape mode in certain applications, or it can be used as user input in games and applications such as Bounce Evolution.[36] While the dashboard or desktop is active, rotating the device from landscape to portrait mode activates the phone application (a feature that can also be disabled at user discretion).[37][38] With update PR1.2, It became possible to view web pages in portrait mode.[39] Developers may add support for portrait mode in their applications if desired.[37][40] There is a proximity sensor which deactivates the display and touchscreen when the device is brought near the face during a call.[41]
The slide-out 4-row keyboard and D-pad of the Nokia N810 have been replaced on the Nokia N900 with a slide-out 3-row backlit keyboard with arrow keys (as with previous Internet Tablets, an on-screen keyboard is also available). In addition to the English QWERTY layout, the slide out keyboard will be available in variants for Italian,[42] French,[43] German,[44] Russian,[45] Czech[46] and Nordic (Finnish, Swedish).[47][48] The Nokia N900 has an ambient light sensor that adjusts the display brightness and activates the backlit keyboard.[49] The OS comes with a word prediction software that can be configured to the user preferences (auto capitalization, word completion, auto spacing between words).[50]
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